Round 2: How an XML instance document references an XML Schema

David Carlisle davidc at
Wed Jan 5 14:47:00 GMT 2000

> A single document may contain names from more than one namespace.

yes of course.

> the pairing is primarily to provide a
> minimal sanity-check that you're getting the schema you think you are,

Hmm not convinced:-) I fear this has all the hallmarks of TeX's \outer:
an error catching device that has generated orders of magnitude
more errors than it ever caught.

If you didn't have to specify the namespace URI again here then you
could naturally specify schema on elements from the null namespace
just by pointing to a schema which defined rules for elements not in a
namespace. Because you do have to specify the namespace then you can't
do that without inventing some magic syntax, and also you have to enter
the (possibly long) namespace URI of the elements in the document twice
once for the namespace declaration and once for this error check.
I would guess that mostly a failure of this error check would be due to
mistyping the URI rather than _trying_ to access a schema for the wrong


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